Modern Surveying Technologies MCQ with answer and solution

Concept

Wave velocity is the distance a wave travels in unit time (one second).

Formula

v = f × λ

Step-by-step solution

1. Frequency is the number of cycles per second. 2. Period is the time taken for one cycle. 3. Wavelength is the distance covered in one cycle. 4. Wave velocity is the distance covered in one second. 5. So the answer is B.

Explanation

The distance an electromagnetic wave covers in one second is its velocity. For EM waves in a vacuum, this is about 3 × 10⁸ m/s. EDM instruments use this velocity to measure distance.

Why the other options are wrong

A: Frequency is cycles per second, not a distance. C: Period is the time for one cycle. D: Wavelength is the distance for one cycle, not for one second.

Shortcut

Distance per second = speed = velocity.

Common mistake

Choosing wavelength, because it is also a distance, but it is the distance for one cycle only.